On 2022-12-20 13:29, Joel Fernandes wrote:
I do want to finish my memory barrier studies of SRCU over the holidays since I have been deep in the hole with that already. Back to the post flip memory barrier here since I think now even that might not be needed…
I strongly suspect the memory barrier after flip is useless for the same reasons I mentioned explaining why the barrier before the flip is useless.
However, we need to double-check that we have memory barriers at the beginning and end of synchronize_srcu, and between load of "unlock" counters and load of "lock" counters.
Where is the barrier at the beginning of synchronize_srcu ? Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com
